Note 6 - Stockholders' Equity (Details Textual) - USD ($)		3 Months Ended
Jun. 26, 2017	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term		7 years 354 days
Proceeds from Issuance of Common Stock		$ 4,939,000
Allocated Share-based Compensation Expense		$ 586,000	528,000
Share Price		$ 2.63
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		$ 2,600,000	0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options		2,900,000
June 2017 Direct Offering [Member]
Proceeds from Issuance of Common Stock	$ 4,900,000
Stock Issued During Period, Shares, New Issues	2,184,000
Share Price	$ 2.50
June 2017 Direct Offering [Member] \| Placement Agency Fees [Member]
Payments of Stock Issuance Costs	$ 300,000
June 2017 Direct Offering [Member] \| Other Offering Expenses [Member]
Payments of Stock Issuance Costs	$ 200,000
Employee Stock Purchase Plan [Member]
Allocated Share-based Compensation Expense		$ 16,000	$ 29,000
Stock Issued During Period, Shares, New Issues		0	0
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date		85.00%
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding		$ 400,000	$ 300,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options		$ 400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		357 days
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		2 years 182 days

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of new stock issued during the period.

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